Cloudflare Security Headers Guide
Inject robust protection headers straight from edge servers.
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Cloudflare Security Headers Guide
Deploying HTTP response headers (like CSP, HSTS, and X-Content-Type-Options) is critical for securing site traffic. By utilizing Cloudflare Transform Rules, you can inject these secure headers at the edge, saving CPU overhead at your origin.
1. How to Inject Headers with Transform Rules
Inside Cloudflare, navigate to **Rules > Transform Rules > Modify Response Header**. Create a new rule targeting all incoming traffic and append the desired secure headers (such as `Strict-Transport-Security` and `Content-Security-Policy`).
Identify exactly which headers your domain is currently missing using our:
2. Preventing CSP Crawling Anomalies
Content Security Policies (CSPs) are excellent for blocking cross-site scripting (XSS), but restrictive policies can mistakenly block Google's rendering assets. Ensure that your directives grant access to verified search crawlers.
Audit your pages for broken JavaScript assets and vulnerabilities using our:
Security Headers Checklist
Enforce HSTS
Inject Strict-Transport-Security with a max-age of 1 year, including subdomains and preload options.
Block Frame Hijacking
Inject X-Frame-Options set to SAMEORIGIN to prevent malicious clickjacking attempts.
Apply X-Content-Type-Options
Set this header to nosniff to enforce browser script compliance.
Official Security Directives
For official network security standards and CSP configuration generators:
Security Tools
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